package cn.com.winning.ecare.utils;

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.KeyGenerator;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class AESTest
{

	public static final String PASSWORD = "WINNING";

	/**
	 * 加密
	 * 
	 * @param content
	 *        需要加密的内容
	 * @param password
	 *        加密密码
	 * @return
	 */
	public static byte[] encrypt(String content, String password)
	{
		try
		{
			KeyGenerator kgen = KeyGenerator.getInstance("AES");
			kgen.init(128, new SecureRandom(password.getBytes()));
			SecretKey secretKey = kgen.generateKey();
			byte[] enCodeFormat = secretKey.getEncoded();
			SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
			Cipher cipher = Cipher.getInstance("AES");// 创建密码器
			byte[] byteContent = content.getBytes("utf-8");
			cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
			byte[] result = cipher.doFinal(byteContent);
			return result; // 加密
		}
		catch (NoSuchAlgorithmException e)
		{
			e.printStackTrace();
		}
		catch (NoSuchPaddingException e)
		{
			e.printStackTrace();
		}
		catch (InvalidKeyException e)
		{
			e.printStackTrace();
		}
		catch (UnsupportedEncodingException e)
		{
			e.printStackTrace();
		}
		catch (IllegalBlockSizeException e)
		{
			e.printStackTrace();
		}
		catch (BadPaddingException e)
		{
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * 解密
	 * 
	 * @param content
	 *        待解密内容
	 * @param password
	 *        解密密钥
	 * @return
	 */
	public static byte[] decrypt(byte[] content, String password)
	{
		try
		{
			KeyGenerator kgen = KeyGenerator.getInstance("AES");
			kgen.init(128, new SecureRandom(password.getBytes()));
			SecretKey secretKey = kgen.generateKey();
			byte[] enCodeFormat = secretKey.getEncoded();
			SecretKeySpec key = new SecretKeySpec(enCodeFormat, "AES");
			Cipher cipher = Cipher.getInstance("AES");// 创建密码器
			cipher.init(Cipher.DECRYPT_MODE, key);// 初始化
			byte[] result = cipher.doFinal(content);
			return result; // 加密
		}
		catch (NoSuchAlgorithmException e)
		{
			e.printStackTrace();
		}
		catch (NoSuchPaddingException e)
		{
			e.printStackTrace();
		}
		catch (InvalidKeyException e)
		{
			e.printStackTrace();
		}
		catch (IllegalBlockSizeException e)
		{
			e.printStackTrace();
		}
		catch (BadPaddingException e)
		{
			e.printStackTrace();
		}
		return null;
	}

	/**
	 * 将二进制转换成16进制
	 * 
	 * @param buf
	 * @return
	 */
	public static String parseByte2HexStr(byte buf[])
	{
		StringBuffer sb = new StringBuffer();
		for (int i = 0; i < buf.length; i++)
		{
			String hex = Integer.toHexString(buf[i] & 0xFF);
			if (hex.length() == 1)
			{
				hex = '0' + hex;
			}
			sb.append(hex.toUpperCase());
		}
		return sb.toString();
	}

	/**
	 * 将16进制转换为二进制
	 * 
	 * @param hexStr
	 * @return
	 */
	public static byte[] parseHexStr2Byte(String hexStr)
	{
		if (hexStr.length() < 1)
			return null;
		byte[] result = new byte[hexStr.length() / 2];
		for (int i = 0; i < hexStr.length() / 2; i++)
		{
			int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1), 16);
			int low = Integer.parseInt(hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
			result[i] = (byte) (high * 16 + low);
		}
		return result;
	}

	public static String encode(String content)
	{
		if(content==null){
			return "";
		}
		// 加密
		byte[] encryptResult = encrypt(content, PASSWORD);
		String encryptResultStr = parseByte2HexStr(encryptResult);
		return encryptResultStr;
	}

	public static String decode(String content)
	{
		if(content==null){
			return "";
		}
		// 解密
		byte[] decryptFrom = parseHexStr2Byte(content);
		byte[] decryptResult = decrypt(decryptFrom, PASSWORD);
		return new String(decryptResult);
	}

	/**
	 * @param args
	 */
	public static void main(String[] args)
	{
		String content = "{jfdz:''缴费地址：东三楼一楼大厅左侧'',jfje:''150'',items:[{name:''血生化'',je:''98.5''},{name:''血常规'',je:''30''},{name:''心电图'',je:''21.5''}]}";
		
		System.out.println("加密后：" + encode(content));
		// 解密
		
		System.out.println("解密后：" + decode(encode(content)));
	}

}
